When notes are discovered that have been printed incorrectly (such as having the serial numbers upside down, etc.) the misprinted "error notes" are replaced with star notes because no two bills within a certain series can be produced with the same serial number. hope this helps thanks for asking!!
you are welcome!! newer star bills are generally worth less even in good condition while older ones are worth much more especially the lower the serial number the better. i got this back as change a gas station not too long ago.. not much value here just a cool collectors item!! check out star bills on ebay on only the sold listings to get a idea of what one could bring!!